UBX-G7020 - Hardware Integration Manual
Design-in
GPS.G7-HW-10003
Objective Specification
Page 17 of 74
2.2.1
SQI Flash memory
An SQI (Serial Quad Interface) flash memory can be connected to the SQI interface (PIO0–PIO5) to provide the
following options:
Run firmware out of the SQI flash and have the possibility to update the firmware
Save data logging results
Store the Functional Configuration permanently
Save the Low Level Configuration (system configuration)
Hold AssistNow Offline data
If updating of the firmware is a prime requirement then an SQI flash must be connected.
Some UBX-G7020 features may be only available with a particular Flash Firmware.
The voltage level of the SQI interface follows the VDD_IO level. Thus make sure the SQI Flash is supplied with the
same voltage as VDD_IO of the UBX-G7020. It is recommended to place a decoupling capacitor (C2) close to the
supply pin of the SQI flash.
Make sure that the SQI Flash supply range matches the voltage supplied at VDD_IO.
Figure 6: Connecting a SQI FLASH memory
Not all the SQI flash devices supported by the UBX-G7020 can be used to do logging, see section 3.4.
To run the firmware out of the SQI flash a minimum size of 4Mb is required. A 4Mb device is also sufficient to
save AssistNow Offline information plus the Low Level Configuration and functional configuration data.
However, to run Firmware from the SQI flash and provide space for logging results, a minimal size of 8Mb is
required. If, on the other hand the SQI flash is just used for logging results and the firmware runs out of ROM, a
4Mb SQI flash can provide reasonable space for logged data.
For a list of supported SQI Flash devices please see Table 19.
There is a configurable VDD_IO monitor threshold (POR_IO) to ensure that the UBX-G7020 only starts if the
VDD_IO supply (which is used to supply the SQI flash), is within the supply range of the SQI flash device. This will
ensure that any connected Flash memory will be detected correctly at startup.
The VDD_IO monitor threshold (POR_IO) must be set according to the SQI supply voltage level (VDD_IO)
in the eFuse by the Low Level Configuration, see section 2.10.2!
Place the SQI FLASH close to the UBX-G7020 chip to keep the interface lines short and if possible route them on
inner layers to avoid noise emission. Also make sure that all the lines are not too-long/ too-thick to reduce
capacitance/ time delays.
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